Commercial revenue increased by 21% at Premier League clubs in the 2012/13 season and topped £2.5 billion for the first time, according to the Annual Review of Football Finance by Deloitte.

However, over 75% of the revenue increase was spent on wages, which rose by £125m (8%) to £1.8billion and resulted in the overall Premier League clubs' wages to revenue ratio reaching a record high of 71%.

These increases led to the aggregate profit falling by £2m to £82m, although 13 of the Premier League clubs made a profit in 2012/13 compared with 10 in the previous year.

Adam Bull, senior consultant at Deloitte, says that wage costs are forecast to increase again in 2013/14: "The pattern in spending on wages following previous increases in broadcast deals, suggests it's likely around 60% or more of the revenue increase in 2013/14 will flow through to wages.

"On that basis, we would expect Premier League total wage costs to reach a new record level of around £2.2billion. However, given the forecast increase in revenue, this would also return the wages to revenue ratio below 70% for the first time since 2009/10."

Dan Jones, partner at Deloitte, said: "Once again the global appeal of the Premier League has continued to drive commercial revenue growth, particularly at the highest ranked Premier League clubs. Matchday revenue also increased by 6% with fewer unsold seats at Premier League games than ever before."Premier League clubs will receive another significant increase in revenue in the 2013/14 season.

Deloitte estimates that revenue will have increased by almost 30% to £3.2 billion in the 2013/14 season.

This growth will be driven by the revenue from the first season of the Premier League's new broadcast deals and further commercial revenue growth at the biggest clubs.